that's standard on almost all cars.
Off-throttle fuel cut.Think of it this way. If RPM > 1500, Throttle <5% there's a good chance your coasting and there's no point in burning gas. So the ECU cuts fuel.
If your revving it, soon as you release the gas pedal the fuel cut will occur once again going to 22 full lean/fuel cut.
So it's designed to save gas by not burning it when you don't need it.
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